A North Korean People’s Navy submarine is missing and presumed sunk, a U.S. official told USNI News on Friday.

The unknown class of submarine was operating off the North Korean coast in the last several days when the submarine went missing.

“About week ago it went missing and the speculation is that it sank,” the official told USNI News.
“The North Koreans have not made an attempt to indicate there is something wrong or that they require help or some type of assistance.”

The official was reluctant to give specific details on the presumed loss of the boat due to sensitivities on how the military was tracking the vessel.

A second U.S. official confirmed the basic facts of the missing submarine. […]